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7a226860ef
* data/skeletons/c.m4 (yytoken_kind_t): New. * data/skeletons/c++.m4, data/skeletons/lalr1.cc (yysymbol_kind_type): New. * examples/c/lexcalc/parse.y, examples/c/reccalc/parse.y, * tests/regression.at: Use them. * doc/bison.texi: Replace "enum yytokentype" by "yytoken_kind_t". (api.token.raw): Explain that it forces "yytoken_kind_t" to coincide with "yysymbol_kind_t". (Calling Convention): Mention YYEOF. (Table of Symbols): Add entries for "yytoken_kind_t" and "yysymbol_kind_t". (Glossary): Add entries for "Kind", "Token kind" and "Symbol kind".
reccalc - recursive calculator with Flex and Bison
In this example the generated parser is pure and reentrant: it can be used concurrently in different threads, or recursively. As a proof of this reentrancy, expressions in parenthesis are tokenized as strings, and then recursively parsed from the parser:
exp: STR
{
result r = parse_string ($1);
free ($1);
if (r.nerrs)
{
res->nerrs += r.nerrs;
YYERROR;
}
else
$$ = r.value;
}